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EchoMap v3.0
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7.3 Interpreting NexRAD Radar Pictures
The figure above shows a NexRAD image with green, yellow and
red cells being displayed, the Wx07 indicator shows that the
image is 7 minutes old. This will automatically count upwards
as time increases so you always know the age of the data. You
can spot significant storm activity between a 110 and 120 heading
at slightly more than 100 and 200 nautical miles away.
The closer you are to the precipitation, the more detail the cell
patterns will provide. The further the activity is from you the less
detail is shown and the larger the grid areas are. Providing more
detailed information at long range would not provide additional
useful strategic information due to the change in weather as you
travel towards it.
Please refer to the Airman’s Information Manual
concerning weather avoidance. Circumnavigate all storm
cells by at least 25 nautical miles.